Sediment and plant dynamics in saltmarshes pioneer zone:: Puccinellia maritima as a key species?
Sediment and plant dynamics in saltmarshes pioneer zone:: Puccinellia maritima as a key species?
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DOI：
10.1016/s0272-7714(02)00185-3
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发表时间：
2003-02-01
影响因子：
2.8
通讯作者：
Bouzillé, JB
中科院分区：
文献类型：
--
作者：
Langlois, E;Bonis, A;Bouzillé, JB
低盐沼在不同地点和潮汐周期之间会受到水流和波浪的侵蚀力、洪水的频率和持续时间以及土壤盐分的影响。先锋区植被的建立与沉积动力学直接相关，但关于植物对沉积动力学影响的数据很少。在圣米歇尔山湾（法国），包括先驱区在内的低盐沼泽的特点是微地形，由以海草碱茅为主的植被的小丘、以大米草、脆弱海蓬子和海茅草为主的低稀疏植被的泥滩以及一些侵蚀带组成。本研究的目的是（1）调查潮汐周期之间和地点之间的沉积物沉积和土壤海拔模式； (2)寻找微地形的发展和动态与不同植物物种之间的关系； (3) 评估海生碱茅是否在增强沉积物沉积以及促进这些低洼沼泽植物演替方面发挥作用。这三个研究地点均位于增生盛行且土壤基质基本为细沙的系统中。沉积物的沉积量在潮汐周期和地点之间有所不同。通过沉积物侵蚀棒测量的土壤水平变化强调了海生碱茅在稳定沉积物沉积方面的重要性。当土壤被碱茅覆盖时，与场地相对遮蔽时裸露沉积物相比，土壤高度增加几乎一倍。在受干扰较多的地点，例如地点 1，碱茅的存在对于土壤高度的增加至关重要，因为它在裸露的土壤上受到侵蚀。碱茅的存在似乎与小丘的安装和微地形密切相关。在 2-3 年内，碱茅覆盖面积增加，盐沼较高层的典型物种在微地形的较高且较稳定的部分（“小丘”）上定居，从而导致演替率增加。 (C) 2003 Elsevier Science B.V. 保留所有权利。
Low saltmarshes are subjected to variability between sites and tidal cycles in terms of erosive forces by current and waves, the frequency and duration of flooding and soil salinity. The establishment of vegetation in pioneer zones is directly related to sedimentary dynamics but few data are available concerning the effects of plants on sediment dynamics. In the Mont Saint Michel Bay (France), the low saltmarshes, including pioneer zones, are characterized by a micro-topography composed of hummocks with vegetation dominated by Puccinellia maritima, mudflats with a low sparse vegetation of Spartina anglica, Salicornia fragilis and Puccinellia maritima and a few erosion zones. The aim of this study was to (1) investigate the sediment deposition and soil elevation patterns, between tidal cycles and between sites; (2) look for a relationship between the development and dynamics of the microtopography and the different plant species; and (3) evaluate whether Puccinellia maritima plays any role in enhancing sediment deposition and therefore plant succession in these lower marshes.The three study sites were situated in a system where accretion prevailed and soil substrate was essentially fine sand. The amount of sediment deposited varied between tidal cycles as well as between sites. The soil level changes, measured by a Sediment Erosion Bar, underlined the importance of Puccinellia maritima in stabilising sediment deposition. When the soil was covered with Puccinellia, the increase in soil level is almost doubled compared with bare sediment when the site was relatively sheltered. In more disturbed sites, such as site 1, the presence of Puccinellia was critical for the increase in soil level as it was eroded on bare soil. The presence of Puccinellia appeared to be strongly linked with the installation of hummocks and the micro-topography. In 2-3 years, Puccinellia cover increased and species typical of higher levels of the saltmarsh became established on the higher and more stable parts of the micro-topography (the 'hummocks'), which led to an increase in the succession rate. (C) 2003 Elsevier Science B.V. All rights reserved.